2i2c-aws-us: Nodegroup split and k8s update

[GeorgianaElena]

Fixes #5090
Ref: #5075 and #5074 and #5114

[github-actions]

Merging this PR will trigger the following deployment actions.

Support and Staging deployments

Cloud Provider	Cluster Name	Upgrade Support?	Reason for Support Redeploy	Upgrade Staging?	Reason for Staging Redeploy
aws	nmfs-openscapes	No		Yes	Following helm chart values files were modified: staging.values.yaml
aws	2i2c-aws-us	No		Yes	Following helm chart values files were modified: dask-staging.values.yaml

Production deployments

Cloud Provider	Cluster Name	Hub Name	Reason for Redeploy
aws	nmfs-openscapes	prod	Following helm chart values files were modified: prod.values.yaml
aws	2i2c-aws-us	showcase	Following helm chart values files were modified: showcase.values.yaml
aws	2i2c-aws-us	ncar-cisl	Following helm chart values files were modified: ncar-cisl.values.yaml
aws	2i2c-aws-us	itcoocean	Following helm chart values files were modified: itcoocean.values.yaml
aws	2i2c-aws-us	cosmicds	Following helm chart values files were modified: cosmicds.values.yaml

[GeorgianaElena]

@sgibson91, just fyi that this morning I came to the conclusion that we only need GPUs for the hubs that will use them and don't have to provision them for all hubs on a cluster.

Same for dask nodegroups.

(In case you run into this situation too)

[github-actions]

🎉🎉🎉🎉

Monitor the deployment of the hubs here 👉 https://github.com/2i2c-org/infrastructure/actions/runs/11855089007